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Cover glass for photoelectric conversion devices and method for producing the same

a technology of photoelectric conversion device and cover glass, which is applied in the directions of semiconductor/solid-state device details, instruments, transportation and packaging, etc., can solve the problems of annoyance in the neighborhood in some cases, and achieve the effect of reducing light reflectance, reducing maximum reflection effect, and large roughness period

Active Publication Date: 2015-11-17
NIPPON SHEET GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]The reflection-reducing film basically serves to reduce the light reflectance by making use of the interference between the light reflected from the interface with a base and the light reflected from the interface with air, and exerts the maximum reflection reducing effect at a specific wavelength to be determined depending on the film thickness and the refractive index of the base and the film. In a cover glass for photoelectric conversion devices, this wavelength is generally set within a visible region or in the vicinity thereof. Therefore, a specific reflection color is made more likely to be visually recognized by forming such a reflection-reducing film. As a result, non-uniformity caused by a slight difference in film thickness becomes susceptible to recognition. In the cover glass according to the present invention, the reflectance curve is extremely flattened in the wavelength range of 380 nm to 780 nm that corresponds to the visible region by using a glass sheet with a comparatively large roughness period and forming a reflection-reducing film so that the number of stacked layers of silica fine particles should be different between on the top portion and on the bottom portion of the uneven surface. Thus, the non-uniformity in the appearance of the cover glass is made less likely to be visually recognized.

Problems solved by technology

However, when the photoelectric conversion device is installed on the roof of a house, light reflected from the cover glass may cause annoyance to the neighborhood in some cases.

Method used

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  • Cover glass for photoelectric conversion devices and method for producing the same
  • Cover glass for photoelectric conversion devices and method for producing the same
  • Cover glass for photoelectric conversion devices and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0063]36.96 parts by weight of a silica fine particle dispersion (PL-7, manufactured by FUSO CHEMICAL CO., LTD, average particle size: 100 nm, solid content concentration: 23 wt %), 56.84 parts by weight of ethyl cellosolve, and 1.0 part by weight of 1N hydrochloric acid (hydrolysis catalyst) were mixed and stirred, to which 5.2 parts by weight of tetraethoxysilane was added under continuous stirring. Subsequently, it was stirred for 8 hours while being maintained at 40° C. Thus, an undiluted solution was obtained. In this undiluted solution, the solid content concentration was 10 wt % and the ratio of the fine particles and the binder (in terms of oxide) in the solid content was 85:15 on a weight basis. The above-mentioned silica fine particles were solid (in other words, non-hollow) fine particles.

[0064]13.0 parts by weight of the undiluted solution, 5.0 parts by weight of propylene glycol, 81.98 parts by weight of 2-propanol, and 0.02 part by weight of a silicone surfactant (Coat...

example 2

[0068]An undiluted solution was obtained in the same manner as in Example 1, except that the proportion of the respective raw materials employed for preparing the undiluted solution was changed as follows: 30.43 parts by weight of the silica fine particle dispersion, 58.17 parts by weight of ethyl cellosolve, 1.0 part by weight of concentrated hydrochloric acid, and 10.4 parts by weight of tetraethoxysilane. In this undiluted solution, the solid content concentration was 10 wt %, and the ratio of the fine particles and the binder (in terms of oxide) in the solid content was 70:30 on a weight basis.

[0069]Meanwhile, a coating solution was obtained in the same manner as in Example 1, except that the proportion of the respective raw materials employed for preparing the coating solution was changed as follows: 17.0 parts by weight of the undiluted solution, 5.0 parts by weight of propylene glycol, 77.95 parts by weight of 2-propanol, and 0.05 part by weight of a silicone surfactant. Note...

examples 3 to 8

[0070]Using a figured glass having the surface shape shown in Table 1 and a coating solution prepared as shown in Table 1, a cover glass was obtained in the same manner as in Example 1. The resultant cover glass of each Example was evaluated for the above-mentioned properties. The evaluation results are shown in Table 1.

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Abstract

In order to eliminate non-uniformity in the appearance of a cover glass for photoelectric conversion devices, the reflectance curve of the cover glass is extremely flattened. Provided is a cover glass for photoelectric conversion devices that includes a glass sheet having an uneven surface such as a figured glass, and a reflection-reducing film formed on the uneven surface. The reflection-reducing film includes silica fine particles and a binder for the silica fine particles. The silica fine particles are arranged in a single layer on the top portion of the uneven surface of the glass sheet, while the silica fine particles are arranged in stacks to a thickness equivalent to at least three layers on the bottom portion of the uneven surface. The uneven surface of the glass sheet has an average spacing Sm of at least 0.4 mm but not more than 2.5 mm and an arithmetic average roughness Ra of 0.5 μm to 5 μm. The cover glass has a reflectance of at least 1.5% but not more than 3% over the entire wavelength range of 380 nm to 780 nm for incident light from the side on which the reflection-reducing film is formed.

Description

TECHNICAL FIELD[0001]The present invention relates to a cover glass for photoelectric conversion devices. The cover glass is arranged on the light incident side of a photoelectric conversion device and transmits light to a photoelectric conversion layer in the conversion device while protecting the photoelectric conversion device.BACKGROUND ART[0002]In a so-called crystalline photoelectric conversion device, a cover glass is generally arranged on the light incident side. However, when the photoelectric conversion device is installed on the roof of a house, light reflected from the cover glass may cause annoyance to the neighborhood in some cases. Therefore, a cover glass having an uneven surface so as to disperse the reflected light is used in applications that require attention to the reflected light, such as those used on the roof of a house.[0003]Since the shape of the surface roughness affects the quantity of light to be transmitted through the cover glass, there have been repor...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B32B5/16B05D1/02G02B1/113G02B1/115H01L31/0216
CPCG02B1/113G02B1/115H01L31/02168Y02E10/50Y10T428/24421G02B1/12H01L23/15
Inventor KOYO, MIZUHOYAMAMOTO, TORUKAWAZU, MITSUHIROKIDO, MASAATSU
Owner NIPPON SHEET GLASS CO LTD
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